Finding the Fourth Proportional to 72,210.88, 99,651.52 and 40,381.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72,210.88 : 99,651.52 = 40,381.12 : x
2. Step 2: Convert to fraction form
   72,210.88/99,651.52 = 40,381.12/x
3. Step 3: Cross multiply
   72,210.88x = 99,651.52 × 40,381.12
4. Step 4: Simplify right side
   72,210.88x = 4,024,039,987.30
5. Step 5: Solve for x
   x = 4,024,039,987.30/72,210.88
6. Step 6: Final answer
   x = 55,726.23